Use of glue for Windshield glass install?
 

Well I searched herein for an opinion, and could not find mention of the use of adhesive/glue on the glass or the seal. The factory workshop manual for earlier car shows a picture where glue goes on the windshield and the seal.

Is glue needed or used? Seems a tight seal can be achieved by tightening up the trip with a wooden ship piece and careful tapping.

Per one of our techs: In the current factory literature, Porsche recommends using a urethane to install the windshield, that may be why Haynes mentions an adhesive.

I don't think urethane is something you really want to use on a G body windshield. However, a softer, flowable sealant can be used if you have a small leak that is difficult to track down such as areas like the windshield corners where the rubber sometimes pulls away and lets water in. Products like Permatex, which is a silicone base, won't "dry" but stay pliable and soft.

Urethane is what is used on more modern flush glass to glue it in to the window channel like on 993 windshields. Once that stuff hardens, you will never get the glass out without breaking it.

NO!

I’ve pulled a number of front windows and removed/installed a Targa window (the toughest/fussiest IMO). You may not experience it but the next person who has to pull your window will bless your name in heaven�� for not gooping up the window. I really don’t think the factory used an adhesive, but I know people have struggled with window seal quality. I’m talking about older air/oil cooled BTW.

The best thing to do is to use 3m strip cualking around the corners at the windshield. It stays pliable and helps prevent water from settling in the lower corners. You can still remove the windshield without any issues.

Unless it's your daily and left outside I wouldnt bother with anything.

I only drive on nice days anyway. If you happen to get caught out and a few drops get it it'll dry up.

A urethane caulk sounds like a nightmare scenario by the way..

I can remove and install a windshield wo sealant very easily so I would just rather be able to check the area (lower window frame) every so often. You dont know what's going to happen after you apply sealant once you install and clean up the mess! You may create a pocket that traps water imho.

Kind regards,


Matt

No glue!

Teroson 804495 Sealant is what most people are using here in Germany.

Guido

No glue, just 3m auto bedding and glazing compound in the corners under the seal -between the body and seal.

Well thanks for all the wise inputs.

Ill be getting some soft ply sealant for the corners just to keep the rain in Arizona (:)) off the metal. I might sell to someone in a rainy state someday? and I can point to this thread too.

Definitely do not want urethane or glue, I got that!

Good luck with your install by the way! I took an old front windshield out of an late 60s Targa today and was surprised to find adhesive. It was a pain, just doubles the time for removal.

I think this is how they are intended.

depending on the condition of your rubber and overlocker you can either get away without anything or you can use a non-setting caulk (eg not a glue, it will always remain goey like the consistency of hard peanut butter.

I once fixed up a 911 that had been in a roll and the window rubber outter lip was ever so slightly too small so in that case is used adhesive under that rubber in the corners to keep it tensioned and from popping back in the recess around the top left and right corners. that's an example of when you'll need to use setting caulk. Sounds like you are not there.